[mutter] display: Make meta_display_open() report errors

[Marge Bot <marge-bot src gnome org>]

commit 89053cc6f772ab3715ed775b8aba234a6a6a5ce4
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Feb 25 21:03:54 2021 +0100

    display: Make meta_display_open() report errors
    
    Instead of just exit():ing, report the error, so the caller can decide
    how to deal with the error.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1833>

 src/core/display-private.h |  2 +-
 src/core/display.c         | 16 +++++++++-------
 src/core/main.c            |  9 +++++++--
 3 files changed, 17 insertions(+), 10 deletions(-)
---
diff --git a/src/core/display-private.h b/src/core/display-private.h
index 3d690fcb66..6008de05fe 100644
--- a/src/core/display-private.h
+++ b/src/core/display-private.h
@@ -260,7 +260,7 @@ struct _MetaDisplayClass
      (time2) != 0)                                                      \
   )
 
-gboolean      meta_display_open                (void);
+gboolean meta_display_open (GError **error);
 
 void meta_display_manage_all_xwindows (MetaDisplay *display);
 void meta_display_unmanage_windows   (MetaDisplay *display,
diff --git a/src/core/display.c b/src/core/display.c
index 5cdfce5eef..0ce0e1c0a6 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -798,9 +798,8 @@ meta_display_shutdown_x11 (MetaDisplay *display)
  * has a window manager.
  */
 gboolean
-meta_display_open (void)
+meta_display_open (GError **error)
 {
-  GError *error = NULL;
   MetaDisplay *display;
   int i;
   guint32 timestamp;
@@ -902,8 +901,11 @@ meta_display_open (void)
   else
 #endif
     {
-      if (!meta_display_init_x11_display (display, &error))
-        g_error ("Failed to init X11 display: %s", error->message);
+      if (!meta_display_init_x11_display (display, error))
+        {
+          g_object_unref (display);
+          return FALSE;
+        }
 
       timestamp = display->x11_display->timestamp;
     }
@@ -917,10 +919,10 @@ meta_display_open (void)
                           display->x11_display->atom__NET_ACTIVE_WINDOW,
                           &old_active_xwindow);
 
-  if (!meta_compositor_do_manage (display->compositor, &error))
+  if (!meta_compositor_do_manage (display->compositor, error))
     {
-      g_error ("Compositor failed to manage display: %s",
-               error->message);
+      g_object_unref (display);
+      return FALSE;
     }
 
   if (display->x11_display)
diff --git a/src/core/main.c b/src/core/main.c
index 76d3ef5df0..888753732c 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -850,6 +850,8 @@ meta_register_with_session (void)
 void
 meta_start (void)
 {
+  g_autoptr (GError) error = NULL;
+
   meta_prefs_init ();
 
 #ifdef HAVE_WAYLAND
@@ -857,8 +859,11 @@ meta_start (void)
     meta_backend_init_wayland (meta_get_backend ());
 #endif
 
-  if (!meta_display_open ())
-    meta_exit (META_EXIT_ERROR);
+  if (!meta_display_open (&error))
+    {
+      g_warning ("Failed to open display: %s", error->message);
+      meta_exit (META_EXIT_ERROR);
+    }
 }
 
 void